No & no,
Dynavin for the X3 isn't connected to the i-Bus like their units on for the E38,39,46s. So no connection to the steering wheel controls for either music control or telephone, the volume buttons do adjust the volume as the music is ported to the ICE speakers.
IMO the Bluetooth on the Dynavin X3 unit is weak as it only comes through the units speakers and is not ported to the ICE speakers.
If I had the OEM Nav I wouldn't replace it with a Dynavin unit, it would be a big job and would necessitate replacing out the head unit to a Business CD unit as well as the additional wiring that would need to be done.
To find a supplier in the Phillipines you could email Renming from
www.swautomotive.co.nz the NZ distributor and ask him to put you in touch with the factory or their distributor in Phillipines.